This diagram from a 1967 documentation shows how to switch high voltage neon lamps with 5V TTL outputs. The circuit can be adapted to function as a shield.
This circuit sources a ramp signal with characteristic given by the diac. The circuit is powered...
Found in old documentation, this circuit is intended for low level amplitude modulation with low...
Found in an article in the August 1971 Radio Electronics magazine, this circuit supports 106...